1973

4.9

2006

4.4

2009

5.5

1981

6.0

1964

6.6

2004

5.9

1980

7.0

2004

4.9

2018

5.2

2004

7.3

2001

2.9

1993

5.0

2004

5.3

2003

6.6

2009

6.3

2019

4.0

2001

5.1

2005

7.1

2017

6.3

2007

4.3